Section 4 - ADJUSTMENT & REPAIR
WARNING
DO NOT attempt any adjustments, maintenance or service with the engine or blades running. STOP blades. STOP engine. Set brake. Remove key. Remove spark plug wire from spark plug and secure wire away from spark plug. Engine and components can be extremely hot. Avoid burns by allowing engine and components sufficient time to cool. Wear heavy leather gloves when handling or working around cutting blades. Blades are extremely sharp and can cause severe injury.
4.4.2.(NINJA) BLADE WEAR LIMITS
The ninja recycling blade requires more frequent service intervals than standard blades. Check for excessive wear and damage before each use. See Figure 4.14.
NEW
BLADE
WEAR LIMIT. (CRACKS
OR NOTCHES BEGIN
TO APPEAR)
DANGEROUS CONDITION!
DO NOT USE ON MOWER!
FIGURE 4.14
4.4.3.(STANDARD) BLADE SHARPENING
Blades should be kept sharp at all times. When the blades are dull, cut grass will be ragged and lawn will usually turn brown. Sharpen standard blades as follows:
1.Move tractor to a firm, level surface.
2.Turn engine "OFF". Remove key.
3.Remove mowing deck from tractor.
4.Remove mower blade(s).
5.If a blade is in good condition, sharpen cutting edge at an angle of 22 to 28 degrees. DO NOT sharpen beyond existing cutting edge. Replace blades not in good condition. See Figure 4.15.
22º TO 28º
STANDARD BLADE 
ORIGINAL CUTTING EDGE
FIGURE 4.15
4.4.4.(NINJA) BLADE SHARPENING
The Ninja recycling blades requires more frequent service intervals than standard blades. When the blades are dull, cut grass will be ragged and lawn will usually turn brown. Sharpen standard blades as follows:
1.Move tractor to a firm, level surface.
2.Turn engine "OFF". Remove key.
3.Remove mowing deck from tractor.
4.Remove mower blade(s).
5.Sharpen all cutting edges of the Ninja recycling blade at an angle of 22 to 28 degrees for optimum performance. See Figure 4.16.
NINJA BLADE
22º TO 28º
BLADE TIP
FIGURE 4.16
22